The essential indoor smart trainer. The KICKR CORE delivers a realistic, accurate, and quiet indoor training experience by using the proven flywheel technology and advanced algorithms of Wahoo's legendary indoor bike trainers. The KICKR CORE indoor trainer is built with the durabilty to withstand all of your indoor training sessions and no other brand of smart trainers has more apps and software training options, including Wahoo SYSTM, Zwift, and Trainer Road. FLEXIBLE AND EASY SETUP KICKR CORE is compatible with 8, 9, 10, and 11 speed cassettes and gives you the flexibility of adding your preferred cassette to the trainer, so that you can fully mimic your outdoor groupset. The Wahoo Fitness app offers guided set-up instructions to fine tune your ride and start training! ECOSYSTEM COMPATIBLE KICKR CORE is compatible with KICKR Trainer Accessories, including the KICKR CLIMB Grade Simulator and KICKR HEADWIND Smart Fan, allowing you to build the ideal setup for your training needs. MULTIPLE BLUETOOTH CONNECTIONS KICKR CORE supports up to three Bluetooth connections simultaneously for a trouble-free workout experience. DESIGNED TO ENDURE The KICKR CORE was built to the quality that cyclists around the world have come to expect from Wahoo. Made to withstand your most intense training sessions, watt for watt — season after season. SPECS - Part Number: WFBKTR4 - Dimensions (legs open): 20"L x 23"W x 19"H - Dimensions (legs closed): 9"L x 23"W x 21"H - Weight (unboxed): 40 lb - Rear Wheel Size: 24" RD / 24" MTB / 650c RD / 26" MTB / 700c RD / 650b MTB / 29" MTB - Hub Types: 130/135mm QR, 12x142, and 12x148 Thru Axle - Adapters: Included - Drivetrain: Cassette not included. - Requires Purchase/Installation of New Cassette: 8/9/10/11 Speed SRAM/Shimano - KICKR CLIMB: Compatible Yes - RPM Cadence: Not Included - Front Wheel Block: Not Included - Resistance Type: Electromagnetic - Accuracy: + / - 2% - Wireless Software Updates: Yes - 3rd Party Power Meter Support: Yes - Connectivity: ANT+, ANT+ FE-C, and Bluetooth - Devices: iOS, Android, PC (Mac and Windows) - Max User Weight: 250 lb - Power Requirements: 100-240V~1.5A 50-60 Hz - Flywheel Weight: 12 lb - Maximum Simulated Grade: 16% - Maximum Power Output: 1800W In The Box • KICKR CORE • Rear Leg • Front Leg • Nuts (x4) • Bolts (x4) • Hex Tool • 1.8mm Spacer • Drive Side Adapter for 130mm and 135mm Quick Release • Reversible hub spacer for 130mm and 135mm Quick Release • Drive Side Adapter for 12x142 and 12x148 Thru Axle • Reversible hub spacer for Thru Axle • AC Power Adapter • Quick Release Skewer Supported Devices PHONE/IPAD iOS 13 or newer ANDROID MACOS BTLE enabled or pair with an ANT+ dongle WINDOWS PCS BTLE enabled or when paired with ANT+ dongle